This sidequest involves helping Rin to solve the mystery of why the machina malfunctioned. When you first connect to the CommSphere in Mi'ihen in Chapter 4, answer "Certainly" to begin. There are several ways to resolve the mystery:

• Section 1
• Switch to Comm 3 and wait until a machina appears then call Rin.
• Switch to Comm 4 and call Rin.
• Section 2
• Switch to Comm 5 and wait until several machina show up, then call Rin.
• Switch to Comm 7 and call Rin. If he finds nothing, continue this section. If he does, then skip to the next section.
• Switch to Comm 1 and wait until a monster appears, then call Rin.
• Switch to Comm 2 and call Rin.
• Switch to Comm 4 and wait until you see a monster chasing a hover, then call Rin.
• Section 3
• Switch to Comm 1 and call Rin.
• Switch to Comm 2 and call Rin. If the man on the roof doen't fall then continue.
• Switch to Comm 5 and call Rin.

In Chapter 5 when you visit the Mi'ihen highroad an Al Bhed woman will approach you. Answer "Not at all." to collect your reward.

• If you followed the instructions carefully, the culprit should turn out to be Rikku, you receive the Ragnarok, gain the ability to ride Chocobos on the highway and receive Episode Complete!
• If the culprit turned out to be the chobobo eater or Calli, you gain the ability to ride Chocobos on the highway and receive Episode Complete!
• If the culprit turned out to be Rin, you receive Gippal's Sphere, gain the ability to ride Chocobos for free and receive Episode Concluded
• If the culprit turned out to be the prophet, you receive only Episode Concluded
• If Rin cannot figure out who the culprit was, you just receive an Ether

• Chapter 4: Celcius
• Chapter 4: Moonflow
• Chapter 5: Mi'ihen